﻿#region Copyright Notice
// This file is part of GestionPedago.
// <description>
// Copyright (C) 2012 ENI Ecole Informatique
// 
// GestionPedago is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// 
// <program> is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
// 
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.
#endregion

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.Objects;
using System.Data;

namespace GestionPedago.EntityContext
{
    public abstract class EntityStateChecker
    {

        public static bool CanReadState(object entity)
        {
            bool res = false;
            ObjectStateEntry entry;
            if (EntityConnection.GetContext().ObjectStateManager.TryGetObjectStateEntry(EntityConnection.GetContext().CreateEntityKey(entity.GetType().Name, entity), out entry))
            {
                res = true;
            }
            return res;
        }

        public static bool IsDetached(object entity)
        {
            bool res = true;
            ObjectStateEntry entry;
            if (EntityConnection.GetContext().ObjectStateManager.TryGetObjectStateEntry(EntityConnection.GetContext().CreateEntityKey(entity.GetType().Name, entity), out entry))
            {
               res = (entry.State == EntityState.Detached);
            }
            return res;
        }

        public static bool IsAdded(object entity)
        {
            bool res = true;
            ObjectStateEntry entry;
            if (EntityConnection.GetContext().ObjectStateManager.TryGetObjectStateEntry(EntityConnection.GetContext().CreateEntityKey(entity.GetType().Name, entity), out entry))
            {
                res = (entry.State == EntityState.Added);
            }
            return res;
        }

        public static bool IsUnchanged(object entity)
        {
            bool res = true;
            ObjectStateEntry entry;
            if (EntityConnection.GetContext().ObjectStateManager.TryGetObjectStateEntry(EntityConnection.GetContext().CreateEntityKey(entity.GetType().Name, entity), out entry))
            {
                res = (entry.State == EntityState.Unchanged);
            }
            return res;
        }

     
    }
}
